Beyoncé reportedly stood by as her sister swung at her husband

Turns out Frank Ocean's return to the stage wasn't the only music news out of last week's Met Gala. According to TMZ, the video below is surveillance camera footage showing Jay Z and Beyoncé along with the "XO" singer's sister and talented performer in her own right, Solange. The clip reportedly shows the Saint Heron boss "unleashing a violent attack" on her brother-in-law in an elevator after the May 5 Metropolitan Museum fundraiser in New York, with Beyoncé present. Judge for yourself below. There's little other information at this point, but we'll keep you updated. The two Knowles sisters danced together just last month onstage at Coachella, to Solange's achingly enduring "Losing You."